import re
import xml.etree.ElementTree as ET

import httplib2
from django.core.management import BaseCommand

from boards.models import GlobalId
from boards.models.post.sync import SyncManager

__author__ = 'neko259'


REGEX_GLOBAL_ID = re.compile(r'(\w+)::([\w\+/]+)::(\d+)')


class Command(BaseCommand):
    help = 'Send a sync or get request to the server.'

    def add_arguments(self, parser):
        parser.add_argument('url', type=str, help='Server root url')
        parser.add_argument('--global-id', type=str, default='',
                            help='Post global ID')
        parser.add_argument('--split-query', type=int,
                            help='Split GET query into separate by the given'
                                 ' number of posts in one')

    def handle(self, *args, **options):
        url = options.get('url')

        pull_url = url + 'api/sync/pull/'
        get_url = url + 'api/sync/get/'
        file_url = url[:-1]

        global_id_str = options.get('global_id')
        if global_id_str:
            match = REGEX_GLOBAL_ID.match(global_id_str)
            if match:
                key_type = match.group(1)
                key = match.group(2)
                local_id = match.group(3)

                global_id = GlobalId(key_type=key_type, key=key,
                                     local_id=local_id)

                xml = GlobalId.objects.generate_request_get([global_id])
                # body = urllib.parse.urlencode(data)
                h = httplib2.Http()
                response, content = h.request(get_url, method="POST", body=xml)

                SyncManager.parse_response_get(content, file_url)
            else:
                raise Exception('Invalid global ID')
        else:
            h = httplib2.Http()
            xml = GlobalId.objects.generate_request_pull()
            response, content = h.request(pull_url, method="POST", body=xml)

            print(content.decode() + '\n')

            root = ET.fromstring(content)
            status = root.findall('status')[0].text
            if status == 'success':
                ids_to_sync = list()

                models = root.findall('models')[0]
                for model in models:
                    global_id, exists = GlobalId.from_xml_element(model)
                    if not exists:
                        print(global_id)
                        ids_to_sync.append(global_id)
                print()

                if len(ids_to_sync) > 0:
                    limit = options.get('split_query', len(ids_to_sync))
                    for offset in range(0, len(ids_to_sync), limit):
                        xml = GlobalId.objects.generate_request_get(ids_to_sync[offset:offset+limit])
                        # body = urllib.parse.urlencode(data)
                        h = httplib2.Http()
                        response, content = h.request(get_url, method="POST", body=xml)

                        SyncManager.parse_response_get(content, file_url)
                else:
                    print('Nothing to get, everything synced')
            else:
                raise Exception('Invalid response status')